A Button-operated calculator is a hardware or software calculator which is operated using button - as oposed to a Formula calculator which is operated thrue entering formulars thue a keyboard.
Reverse Polish Notation
infix logic
algebraic logic
BASIC notation
In BASIC notation the formular is entered as it would be entered in BASIC PRINT command - the PRINT command itself beein optional. On pressing the ENTER the result would be displayed. Typing mistakes in the entered formular could be corrected using the same editor function as available when programming the calculator.
Some BASIC programmable Pocket computers had dedicated trigonometric keys [1] hance the keystroke count is given as a range.
Some BASIC programmable Pocket computers could also be operated in arithmetic logic.
| Formular | Key strokes | Key stroke count |
|---|---|---|
|
6 | |
SIN ( 3 0 ) × COS ( 3 0 ) ENTER
|
12 .. 16 |
Direct algebraic logic (D.A.L.)
Direct algebraic logic (D.A.L.) is a method for entering equations on scientific calculators which allows symbols and numbers to be entered as they are written. SHARP introduced it in 1992[2]. Today D.A.L. is used almost with every scientific calculator except those which use Reverse Polish Notation.
Other known entry modes are Algebraic logic (A.L.) which was used in earlier calculators and BASIC notation which was used BASIC programmable Pocket computers. Both can be seen as ancestors to D.A.L.
Example:
- with reverse polish notation
30SIN30COS×- with algebraic logic
30SIN×30COS=- with direct algebraic logic
SIN30→×COS30ENTER
Note 1: the →: most DAL calculators will automatically insert needed ( ) and the → skips over the ) from the sin operation. Machines equipped with an alphanumeric display will display SIN(30)×COS(30) before pressing ENTER.
References
- ^ The picture of the FX-880P show sin, cos and tan keys on the second row right hand side.
- ^ D.A.L description from Sharp
External links
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